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  Subjects -> CHEMISTRY (Total: 765 journals)
    - ANALYTICAL CHEMISTRY (45 journals)
    - CHEMISTRY (530 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (40 journals)
    - ORGANIC CHEMISTRY (40 journals)
    - PHYSICAL CHEMISTRY (63 journals)

ANALYTICAL CHEMISTRY (45 journals)

Accounts of Chemical Research     Full-text available via subscription   (Followers: 174)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 7)
Acta Analytica     Hybrid Journal   (Followers: 6)
Advances in Analytical Chemistry     Open Access   (Followers: 17)
American Journal of Analytical Chemistry     Open Access   (Followers: 24)
Analytica Chimica Acta     Hybrid Journal   (Followers: 31)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 24)
Analytical Chemistry     Full-text available via subscription   (Followers: 261)
Analytical Chemistry Insights     Open Access   (Followers: 15)
Analytical Letters     Hybrid Journal   (Followers: 6)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 2)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 4)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 22)
Current Analytical Chemistry     Hybrid Journal   (Followers: 5)
Drug Testing and Analysis     Hybrid Journal   (Followers: 3)
Electroanalysis     Hybrid Journal   (Followers: 3)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 4)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription  
International Journal of Analytical Chemistry     Open Access   (Followers: 19)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 2)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 4)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 3)
ISRN Analytical Chemistry     Open Access   (Followers: 13)
ISRN Chromatography     Open Access   (Followers: 1)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 4)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 6)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 12)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 2)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 2)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 3)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 17)
Main Group Metal Chemistry     Full-text available via subscription  
Microchemical Journal     Hybrid Journal   (Followers: 2)
Phytochemical Analysis     Hybrid Journal   (Followers: 1)
Polish Journal of Chemical Technology     Open Access   (Followers: 2)
Reviews in Analytical Chemistry     Full-text available via subscription   (Followers: 6)
Surface and Interface Analysis     Hybrid Journal   (Followers: 12)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 5)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 17)
Trends in Environmental Analytical Chemistry     Hybrid Journal  
Vibrational Spectroscopy     Hybrid Journal   (Followers: 8)
Journal Cover Journal of Analytical Chemistry
   [14 followers]  Follow    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
     ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
     Published by Springer-Verlag Homepage  [2209 journals]   [SJR: 0.322]   [H-I: 17]
  • Preconcentration by solid-phase microextraction
    • Abstract: The review is devoted to a new method of sample preparation, solid-phase microextraction. Its advantages are miniaturization; considerable reduction or even complete elimination of the use of toxic solvents; high concentration factors; low cost; simplicity of coupling with instrumental methods of analysis; and possibility of automation. The main versions of solid-phase microextraction and the parameters of their optimization are considered, such as the chemical composition of the adsorbent, the thickness of the adsorbing coating, pH, the nature and concentration of the salting-out agent, extraction time, stirring intensity, temperature, desorption conditions, and analyte derivatization. Examples of using solid-phase microextraction in the analysis of environmental samples, biological samples, and foodstuffs are presented.
      PubDate: 2014-08-01
       
  • Selective voltammetric and flow-injection determination of guanine and
           adenine on a glassy carbon electrode modified by a ruthenium
           hexachloroplatinate film
    • Abstract: An inorganic film of ruthenium hexachloroplatinate (RuPtCl6), deposited on the surface of a glassy carbon electrode, exhibits electrocatalytic activity in the oxidation of purine bases, such as adenine and guanine. Appropriate working conditions are found for fabricating a polymer film on the surface of glassy carbon and for recording the maximum electrocatalytic effect for the modified electrode. A method is developed for the selective voltammetric determination of guanine and adenine in their simultaneous presence on an electrode modified by a RuPtCl6 film. A procedure is proposed for the amperometric detection of purine bases with this modified electrode under the conditions of flow-injection analysis. The dependence of the analytical signal on the concentration of guanine and adenine is linear up to 5 × 10−6 and 5 × 10−7 M in the stationary mode and to 5 × 10−7 and 5 × 10−8 M under flow conditions, respectively. The proposed method was tested in the analysis of calf thymus DNA for the concentrations of guanine and adenine.
      PubDate: 2014-08-01
       
  • Determination of urea and creatinine by chronoamperometry
    • Abstract: s Methods are developed for the non-enzymatic chronoamperometric determination of urea in blood serum and creatinine in model solutions imitating the composition of blood serum. The selectivity of determination is ensured using columns packed with an anion-exchange resin for urea or synthesized molecularly imprinted polymers for creatinine.
      PubDate: 2014-08-01
       
  • Determination of Rhein in blood plasma by HPLC with UV detection and its
           application to the study of bioequivalence
    • Abstract: A method is proposed for determining rhein (an active metabolite of diacerein) in human blood plasma by reversed-phase high-performance liquid chromatography with UV detection. The analyte was selectively extracted from blood plasma by liquid-liquid extraction with a 5% solution of tert-butyl methyl ether in ethyl acetate. The recovery of rhein is 68 ± 3%, LOQ 100 ng/mL. The stability of the analytes and linearity, selectivity, sensitivity, reproducibility, and accuracy of the developed method are evaluated. The pharmacokinetics of diacerein in the oral administration of drug formulations by 18 healthy volunteers is studied.
      PubDate: 2014-08-01
       
  • European Analytical Column Number 42
    • PubDate: 2014-08-01
       
  • A highly sensitive spectrophotometric determination of ultra trace amounts
           of azide ion in water and biological samples after preconcentration using
           dispersive liquid-liquid microextraction technique
    • Abstract: A simple and highly sensitive method developed for preconcentration and spectrophotometric determination of ultra trace amounts of azide ion (N 3 − ) in water and biological samples using dispersive liquid-liquid microextraction (DLLME) technique. The method is based on ion association formation of azide ion with malachite green and extraction of the ion pairing product using DLLME technique. Some important parameters, such as reaction conditions and the kind and volume of extraction solvent and disperser solvent were studied and optimized. The calibration curve was linear in the range of 0.5–50 μg/L of azide ion. Also, the enrichment factor and extraction recovery obtained were 24.7 and 98.7%, respectively. The method was applied to the determination of azide ion in water and biological samples.
      PubDate: 2014-08-01
       
  • Simple, rapid and sensitive method for the determination of mefenamic acid
           in pharmaceutical preparations
    • Abstract: Two simple and fast automated methods for the direct determination of mefenamic acid (MEF) in pharmaceutical samples are described. Continuous flow and stopped-flow systems with spectrophotometric detection of mefenamic acid with sodium nitroprusside and hydroxylamine hydrochloride were developed. Both methods show a good reproducibility (RSD < 1.5 and 1.8%, respectively) and a wide range of linearity (between 10–500 and 3–300 μg/mL). The stopped-flow protocol has a lower detection limit (1.2 μg/mL) with a sensitivity of about two times greater than the continuous flow technique. The proposed procedures are rapid, reliable and can be applied successfully to the estimation of mefenamic acid in different commercial forms.
      PubDate: 2014-08-01
       
  • Comparative investigation on chemical constituents of flower bud, stem and
           leaf of Lonicera
           japonica
    Thunb. by HPLC-DAD-ESI-MS/MS       class="a-plus-plus">        class="a-plus-plus">n and GC-MS
    • Abstract: In approaches of HPLC coupled with diode array detector tandem multiple mass spectrometry (HPLC-DAD-ESI-MS/MS n ) and GC-MS techniques, efficient comparative methods were developed to profile the chemical constituents in flower bud, leaf and stem parts of Lonicera japonica Thunb. (LJT). 22 polar compounds of various chemical structures and 19 volatile or semi-volatile compounds were tentatively identified from aerial parts of the plant. A number of common composition groups in three separate parts of the plant were proposed, including phenolic acids, flavonoids, iridoids, alkanes, olefins and sterols, the leaf showing higher similarity with the flower bud part via their chemical constituents. Considering the fact that the leaf part has a lot of similar components with the flower bud, this study indicates the leaf part of LJT can be expected to be used as an alternative medicinal resource to the flower bud and stem of the plant.
      PubDate: 2014-08-01
       
  • The composition of commercial acetylated glycerol samples determined by
           13C and        class="a-plus-plus">1H NMR. The comparison with
           gas chromatography
    • Abstract: A convenient method for the analysis of commercial acetylated glycerol samples based on 13C NMR is presented with the accuracy comparable to the standard gas chromatography approaches. The advantage of method is that it does not need any sample derivatization procedure by silyl groups and its application is much more straightforward, as compared to the published 1H NMR method.
      PubDate: 2014-08-01
       
  • Determination of acysole in whole blood by high-performance liquid
           chromatography
    • Abstract: A method is developed for the determination of a carbon monoxide antidote acysole in whole blood using hydrophilic interaction high-performance liquid chromatography with UV detection. Two methods were used for sample preparation: protein precipitation with acetonitrile and solid-phase extraction (SPE) with an acysole recovery of 95.8 and 89.8%, respectively. Chromatographic determination was performed in the isocratic mode on a Nucleodur HILIC column and with an acetonitrile: water 95: 5 mobile phase at 225 nm. The calibration graphs are linear in the concentration range 0.056–111.1 μg/mL. The limits of detection and determination of acysole were 0.050 and 0.120 μg/mL after protein precipitation with acetonitrile and 0.071 and 0.169 μg/mL with SPE, respectively.
      PubDate: 2014-08-01
       
  • Voltammetric determination of sterically hindered phenols in
           surfactant-based self-organized media
    • Abstract: Tert-butylhydroquinone (TBHQ), butylhydroxyanisole (BHA), and butylhydroxytoluene (BHT) are irreversibly oxidized on a glassy-carbon electrode in a medium of acetonitrile-Britton-Robinson buffer solution (1: 9, pH 3.0) at 0.61, 0.79, and 1.1 V, respectively, to give quinones. Micellar media of Triton X100,Brij® 35, and sodium dodecyl sulfate affect their oxidation. The splitting and suppression of the oxidation steps for sterically hindered phenols (SHP) is observed in the presence of nonionic surfactants. Sodium dodecyl sulfate considerably enhances anodic currents and also shifts positive potentials to lower values. The conditions of the differential-pulse voltammetric determination of SHP in a 0.1 M sodium dodecyl sulfate supporting electrolyte are found. The calibration graphs are linear in the ranges 2.02–1010, 2.34–1170, and 6.15–615 μM and the detection limits (S/N = 3) are 0.23, 0.18, and 3.5 μM for TBHQ, BHA, and BHT, respectively. The possibility of determining SHP in TBHQ-BHT and BHA-BHT mixtures in wide ranges of component concentration is demonstrated. A method is developed for the extraction-voltammetric determination of BHT in vegetable oils.
      PubDate: 2014-08-01
       
  • Simultaneous determination of ten constituents in herbal formulation
           Sipjeondaebo-tang using HPLC-PDA
    • Abstract: A simple, rapid, and accurate high-performance liquid chromatographic method was applied to the quantitative determination of 10 components, namely, 5-hydroxymethyl-2-furaldehyde, albiflorin, paeoniflorin, liquiritin, ferulic acid, nodakenin, coumarin, cinnamic acid, cinnamaldehyde and glycyrrhizin in the traditional herbal formulation Sipjeondaebo-tang (SJDBT). All components were separated within 40 min using a Gemini C18 column maintained at 40°C. The mobile phase was composed of 1.0% (v/v) aqueous acetic acid and 1.0% (v/v) acetic acid in acetonitrile by gradient elution. The flow rate was 1.0 mL/min and the detector was a photodiode array (PDA) set at 230, 254, 280, 320, and 330 nm. The calibration curves showed good linearity (r 2 ≥ 0.9993) in different concentration ranges. The recovery of each component was in the range of 92.3–104.8%, with relative standard deviations (RSDs) less than 2.5%. The RSDs for intra- and inter-day precision were 0.09–2.8% and 0.07–3.2%, respectively. The amounts of the 10 components in SJDBT were in the range of 0.18–5.77 mg/g.
      PubDate: 2014-08-01
       
  • Direct determination of antibacterial norfloxacin in urine by isopotential
           fluorimetry
    • Abstract: A novel and simple method is presented for the determination of norfloxacin in human urine by matrix isopotential synchronous fluorescence spectrometry (MISF). This method is useful for the determination of compounds in samples with unknown background fluorescence, such as norfloxacin in urine, without the need for tedious sample pre-treatment. The method was performed in ethanol-water medium (10% v/v), at an apparent pH of 4.8 provided by adding sodium acetate-acetic acid buffer solution. In the determination of norfloxacin in urine the fluorescent intensity varied linearly with its concentration from 20 to 200 ng/mL. An exhaustive statistical analysis has been developed to all calibration graphs, this treatment includes robust regression such as least median of squares, which also detects outliers and leverage points. The overall least-squares regression has been applied to find the more exact straight line that fits the experimental data. The error propagation has been considered to calculate the detection limit and the repeatability of the method. The method shows very low detection limits with acceptable recoveries and precisions. The applicability of the proposed method was illustrated in the determination of norfloxacin in human urine sample without sample pre-treatment.
      PubDate: 2014-08-01
       
  • Possibilities of micro X-ray fluorescence spectrometry of solutions with
           preconcentration
    • Abstract: Results of investigations in energy-dispersive X-ray fluorescence analysis aimed at the development of a high-sensitivity method of microanalysis of solutions are presented. A combined scheme of analysis of one drop of solution of the volume several microliters is proposed and tested. The scheme includes a new preconcentration method based on the drop evaporation in the presence of a micrograin of a hydrophilic adsorbent followed by the microanalysis of the solid phase on the portable device with a polycapillary lens with a focal spot of 10 μm designed at the Institute of Physical Optics. Analytically meaningful X-ray fluorescence spectra are obtained using DETATA (grain diameter about 100 μm) and SAC8 (50 μm) adsorbents and individual drops of model solutions containing Mn, Fe, Co, Ni, Cu, and Zn (0.2 mg/L and higher) and analytical characteristics of the proposed approach are demonstrated.
      PubDate: 2014-08-01
       
  • Voltammetric and flow-injection determination of carbohydrates using
           composite electrodes based on carbon nanotubes and Nickel(II)
           hexacyanoferrate
    • Abstract: The catalytic activities of oxo and hydroxo forms of nickel(II) on the surface of a nickel deposit and an inorganic film of nickel(II) hexacyanoferrate(III) (NiHCF) electrodeposited on a glassy-carbon electrode both unmodified and modified by multi-wall or single-wall (also functionalized) carbon nanotubes in the electrooxidation of glucose, sucrose, and maltose are compared. A more pronounced catalytic effect was obtained in the electrooxidation of these carbohydrates on an electrode modified with functionalized singlewall carbon nanotubes and a NiHCF film. Methods are proposed for the voltammetric and flow-injection determination of carbohydrates on this composite electrode. A linear dependence of the analytical signal on the analyte concentration was observed in the range from 5 × 10−7 to 5 × 10−2 M under stationary conditions and from 0.003 to 0.3 μmol under flow conditions.
      PubDate: 2014-07-01
       
  • Possibilities of cryogenic autoradiography
    • Abstract: Photographic properties of one of atomic photodetectors are studied at the temperature of liquid nitrogen. The characteristic curves obtained at room and cryogenic temperatures indicate that the detector retains its physical and photographic properties, and its possibilities can be expanded to studies of deeply frozen samples. The data obtained point to an increase in the sensitivity of the photographic material frozen to cryogenic temperatures at short exposures.
      PubDate: 2014-07-01
       
  • Determination of important flavour precursor compounds (Amadori compounds)
           in cigarettes by LC-MS/MS
    • Abstract: A simple and rapid determination of two Amadori compounds in cigarettes, 1-deoxy-1-L-proline-D-fructose (Fru-Pro) and 1-deoxy-1-L-alanine-D-fructose (Fru-Ala), which are the important intermediates in Maillard reaction, was achieved by HPLC-MS/MS. Eighty-eight commercial brand cigarettes of 5 different styles were employed to investigate their diversities on Fru-Pro and Fru-Ala. The contents of Fru-Pro and Fru-Ala in all cigarette samples correlate with each other. Comparison of the contents of two compounds reveals a substantial difference for different cigarettes: the contents of the two Amadori compounds in Chinese flue-cured cigarettes are remarkably higher than in British flue-cured, American, Japanese and Chinese blend cigarettes. This might be beneficial for using these two compounds as characteristic markers to identify the flavor-specific Chinese flue-cured cigarettes.
      PubDate: 2014-07-01
       
  • Comparative study of chromatographic, spectrophotometric and non aqueous
           titrimetric methods for determination of protease inhibitor in tablets
    • Abstract: The paper describes HPLC, UV spectrophotometric and non aqueous titrimetric method for the estimation of poorly water soluble protease inhibitor. Ritonavir in raw material and tablet dosage form. HPLC analysis was carried out in a C18 column using acetonitrile, methanol, and buffer in the ratio 60: 20: 20 (v/v/v) at 240 nm. For the spectrophotometric determination, methanolic solution of Ritonavir was reacted with 3-methyl benzothiazolin-2-one hydrazone (MBTH). The oxidative coupled green coloured chromogen was analysed at 633 nm. Non aqueous titration was carried out using perchloric acid as titrant and the end point was determined using crystal violet as indicator. The three methods were validated and statistically evaluated to correlate the difference between the methods for estimation of Ritonavir in pharmaceutical dosage form.
      PubDate: 2014-07-01
       
  • Multielement determination of the composition of sulfide ores using X-ray
           fluorescence analysis
    • Abstract: The potentials of the multielement X-ray fluorescence analysis of sulfide ores from one sample are studied. Using cluster analysis, sulfide ores are divided into four groups; within each group, the ores are similar in chemical composition and matrix effects. Calibration equations are obtained for each group. The performance characteristics of the determination results are evaluated.
      PubDate: 2014-07-01
       
  • Spectrofluorimetric determination of cephradine in commercial formulation
           using ethylacetoacetate-formaldehyde as fluorogenic agent
    • Abstract: A simple, precise and sensitive spectrofluorimetric method was developed for the determination of cephradine in pharmaceutical formulations. The method is based on reaction of cephradine with ethyl acetoacetate (EAA) in the presence of formaldehyde in acidic media. The fluorescence intensity of the resultant fluorescent derivative was measured at 443 nm after excitation at 350 nm. The effects of various experimental parameters on the formation of the fluorescent product were studied and optimized. A linear relationship between concentration of cephradine and fluorescence intensity was found over the range of 0.1–5.0 μg/mL. The limit of detection and quantification were calculated an found 1.09 × 10−2 ± 3.64 × 10−3 μg/mL and 3.64 × 10−2 ± 3.64 × 10−3 μg/mL, respectively and with relative standard deviation (RSD) 4.14%. Accuracy of the method was checked by standard addition method and applied to four different commercial formulations. The percentage recovery was found in the range of 97.03 to 103.80% for Velora suspension, 98.16 to 102.90% for velocef injection, 99.00 to 108.10% for Velora capsule and 99.06 to 104.90% for Cefradin capsule. The good percentage recoveries from all samples indicated that there were no interferences from the common excipients of formulations. The proposed method was successfully applied to the analysis of commercial suspension, capsule and injections. The result obtained by the proposed method was statistically validated with reference HPLC method. No significant difference in the results of the two methods was found regarding accuracy and precision using Student’s t-test and the variance ratio F-test.
      PubDate: 2014-07-01
       
 
 
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